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1.
取20日龄雄性昆明小鼠150只,随机分为5组。取性成熟雌雄昆明小鼠150对,也随机分为5组。各组分别喂含Zn50mg/kg的基础日粮和含Zn60、70、80、90mg/kg的添加Zn日粮。生长试验30天,繁殖试验观察2个胎次。结果表明,日粮Zn水平对实验小鼠体增重、饲料效率、繁殖力(初生窝仔数、初生窝重、离乳窝仔数、离乳窝重)无显著差异(p>0.05)。血清、肝脏、胰脏、肾脏、胫骨含Zn量及血清碱性磷酸酶活性各处理间也无显著差异(p>0.05)。说明以常规组份配合的天然组份日粮含Zn量不仅能满足实验小鼠生长和繁殖对Zn的需要,而且组织Zn也已达到饱和状态,额外补Zn没有意义  相似文献   

2.
选择42头成年生产黑熊,随机分为3组,试验期12个月,研究高、中、低粗蛋白水平(23.6%、19.1%、14.2%)的日粮对生产黑熊取胆量和熊胆粉中结合性牛磺熊去氧胆酸(C26H45NO8S)含量的影响。以确定生产黑熊取胆量与结合性牛磺熊去氧胆酸含量的最佳平衡日粮配方。试验结果表明:生产黑熊采用粗蛋白水平为19.1%的日粮配方最为适宜。  相似文献   

3.
外源酶对大熊猫日粮营养物质消化率影响的研究   总被引:4,自引:0,他引:4  
应用外源性复合酶制剂,对移地保护圈养大熊猫进行了消化试验。试验结果表明,在日粮中添喂1.5‰和3.0‰的营养性复合酶或纤维素复合酶,均能显著提高大熊猫对日粮各营养物质的消化率,其中,对日粮粗蛋白和氨基酸的消化率:添喂3.0‰的效果优于添喂1.5‰水平的效果;对日粮粗酯的消化率:添喂1.5‰的效果优于添喂3.0‰水平的效果;对日粮纤维素、半纤维素和NDF,ADF的消化率:添喂纤维素复合酶的效果极显著;而且,随添喂水平的提高(1.5‰到3.0‰),其日粮纤维素等物质的消化率亦随之显著提高;添喂复合酶纤维素等物质的消化率亦有良好的助消化作用。  相似文献   

4.
根据4×4拉丁方设计,4只体重相似(45kg)的阉公绵羊(Blackface×Suffolk)在不同试验期分别饲喂400,800,1200和1600g/d配合饲料(GD),相应采食量为7.22,14.44,21.18和28.87gDM/kgBW。尿中嘌呤代谢物排泄量(PD)和瘤胃微生物蛋白质产量(MPY)分别为3.56,7.05,11.28,17,59mmol/d和12.0,20.7,22.8,28.3gMN/kgDOMR.日喂饲料量增加对消化率影响不大,却明显提高了蛋白质的生物学价值(ABV)和净利用率(NPU).  相似文献   

5.
玉米秸经纤维毛壳菌( Chaeto micu m cellulolyticu m ) S M27 发酵后制成的纤维蛋白饲料( Ferm eted product of corn stalk , F P C S) 作为日粮中的粗蛋白源,喂饲白鼠和白兔,进行了系统的毒理分析和营养价值测定.毒理测试包括急性毒性试验( L D50 测定和7 d 喂养试验) ,蓄积毒性试验、致突变试验、90 d 喂养毒性测定等,结果表明 F P C S 的 L D50 对瑞士小白鼠和 Wistar 大白鼠都大于2154 g/kg 体重,在7 d 、28 d 和90 d 喂养中都未曾观察到动物机体有异常表现.微核试验中,各试验组与阴性对照组间无显著差异( p > 0 .05) ,与阳性对照组间则有显著差异. F P C S 在白兔日粮中由17 .5 % ( w/ w ,重量比,下同) 增至32 .5 % 时,其营养价值递减,但粗蛋白的消化率各组间无显著变化( p > 0 .05) ,多指标多重分析表明, F P C S 作为动物饲料有安全性,具有粗蛋白可被消化而残余粗纤维难被消化的特点,适用于作为反刍动物日粮中粗蛋白的部分替代物.  相似文献   

6.
日粮调制对肥育猪生产效果的影响   总被引:1,自引:1,他引:0  
为了确定养猪适宜的日粮调制方法,对湿拌料、湿拌浸透料和干粉料进了两次生产效果比较试验.试验Ⅰ将90头51kg左右的育肥猪(大白×荣昌)随机分为3组,A组饲喂干粉料,B组饲喂湿拌料(料水比1:1.5),C组按B组处理后堆放3小时,让其被水浸透,然后再饲喂,A、B、C3组的平均日增重分别为414.7g,432.6g和459.5g;日采食风干料分别为2.06kg,2.13kg和2.21kg;每增重1kg耗风干饲料为4.98kg、4.92kg和1.82kg,耗DE62.09MJ、61.42MJ和60.12MJ,耗CP761.3g、753.0g和737.2g.试验Ⅱ将20头断奶仔猪(长白×成华)分为两组,对照组饲喂干粉料,试验组喂湿拌料(料水比1:1.5),对照组日增重,平均每日采食风干料,每增重1kg耗风干料、DE和CP分别为497.0g、1.70kg、3.24kg、45.21MJ和536.5g,试验组相应为526.5g、1.76kg、3.17kg、44.13MJ.523.98g.  相似文献   

7.
病毒灵,板蓝根对鼠肝炎阳性群小鼠影响的研究   总被引:1,自引:0,他引:1  
在小鼠育种期内投喂病毒灵和板蓝根,小鼠平均每胎产仔数由7.3只提高到10.9只(P<0.05),每胎平均产仔数12只的种鼠由占种群的20%提高到64%(P<0.01),小鼠群鼠肝炎血清抗体阳性检出率由45%下降到5%,经过一年多的观察,小鼠的质量和生产性能稳定  相似文献   

8.
19只阉公羊(Blackface×Suffold)根据体重不同分为三组,各组每日每只绵羊饲喂干草/精料型配合日粮1000g,其余食量分别为13.1、17.4和26、8gDM/kgW,尿中嘌呤代谢物和瘤胃微生物蛋白质产量从5.65和12.11提高到10.37mmol/d和28.09MN/kgDOMR。各组干物质和有机物的表观消化率变化不大,但绵羊的体重下降和采食量提高引起饲料中粗蛋白质消化率的明显下降,蛋白质净利用率却明显上升(P<0.01)。  相似文献   

9.
应用孕激素、苯甲酸雌二醇、孕马血清和前列腺素、孕马血清或促卵泡素探索黑熊人工诱导发情。发情检查采用外阴观察并结合阴道涂片。繁殖季节试验母熊16头,效果明显;非繁殖季节试验9头,发情率100%,3d发情同期率为66.6(6/9);5d为33.3(3/9)。  相似文献   

10.
傅军 《今日科技》2000,(8):34-35
一、材料与方法1.对象普通及新西兰纯种兔26只,由浙江省实验动物中心提供及饲养.雌雄不拘。年龄3~4个月。无人畜共患疾病。免随机分入阿霉素组(ADR组)、对照组(NS组)和阿霉素加牛磺酸组(Tau组)。ADR组9只,体重1.60~1.95kg(1.74kg±0.12kg),ADR用生理盐水配制成lmg/ml,于耳缘静脉注射ADR每次2mg/kg,每周1次,共8次。对照组9只,体重l.60~2.05kg(1.79kg±0.14kg),于耳缘静脉注射生理盐水每次2ml/kg,每周1次,共8次。Tau…  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

13.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

14.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

15.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

16.
本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。  相似文献   

17.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

18.
19.
The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to  相似文献   

20.
Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with  相似文献   

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